Short answer is yes, plan to use these in motor vehicles. There are voltage regulators for that aren't there? Or (I'm opening the door for newb criticism here probably) isn't that typically what the function of a capacitor is? To smooth out voltages? Ugh, sorry for being so new...lolSgtWookie said:If you're planning on such use, you should tell us so that we can make suggestions.
Can you suggest one? How do you decide which is best over the others? (I imagine there's probably text on LL MOSFETs somewhere).eblc1388 said:A logic level MOSFET is preferred because its saturation voltage is lower than the darlington(about 0.1V vs 1~2V) so will be cooler and even let you place more LEDs in series in one branch than using a darlington.
Will THIS work for that purpose?SgtWookie said:If so, you need to be aware that the actual voltage in the system can vary considerably; from a low of around 11.4v when the battery is heavily discharged and the engine is off, to 14.5v or even higher when the engine is running, charging a heavily discharged battery.
Well, you could likely get by with a lower Vdss rating, but automotive environments can be pretty brutal. The higher voltage rating won't hurt you, as long as the total gate charge doesn't skyrocket with a plummeting current capacity .And why must it be over 100 Volts? Isn't that a lot for this application? I'm only asking these questions by the way to understand the reasons behind these decisions. Not to be a pain in everyone's rear.
That's a good choice; they should work fine.Part I had in mind for that is HERE
I have one other quesiton about this, what is the purpose of 0Ω resistors? There appears to be several of them on the schematic on page 23 of this document.Hello,
The 78T12 will not work all the time.
There has to bee a voltage difference of 2.5 Volts between in and output to let the regulator work properly.
You might want to look at a buck-boost converter like the LM5118.
This can regulate 4 - 70 volts input to 12 volts output.
See page 23 of the datasheet (it is not as simple as the 78T12).
Greetings,
Bertus
They also have three pins. The control is done via the Gate pin as you have already guessed. You need to follow the good practice mention in last sentence of post#31 by SgtWookie regarding gate connection to the MCU.I recently got familiar with the leads on the NPN transistors, but MOSFETs at this point are new to me...lol.